Login & Signup iOS Swift - Core Data -

i want create login , signup functions within swift using core data.

this code store data in signupvc;

    let appdel:appdelegate = (uiapplication.sharedapplication().delegate as! appdelegate)     let context:nsmanagedobjectcontext = appdel.managedobjectcontext      let newuser = nsentitydescription.insertnewobjectforentityforname("users", inmanagedobjectcontext: context) nsmanagedobject     newuser.setvalue(txtusername.text, forkey: "username")     newuser.setvalue(txtpassword.text, forkey: "password")     newuser.setvalue(txtemailadd.text, forkey: "email")      {         try context.save()     } catch {}      print(newuser)     print("object saved.") 

this code in loginvc;

@ibaction func signintapp(sender: uibutton) {      let appdel:appdelegate = (uiapplication.sharedapplication().delegate as! appdelegate)     let context:nsmanagedobjectcontext = appdel.managedobjectcontext      let request = nsfetchrequest(entityname: "users")     request.returnsobjectsasfaults = false     request.predicate = nspredicate(format: "username = %@", "" + txtusername.text!)      let results:nsarray = try! context.executefetchrequest(request)        if(results.count > 1){         let res = results[0] as! nsmanagedobject         txtusername.text = res.valueforkey("username") as! string         txtpassword.text = res.valueforkey("password") as! string          //for res in results {          //   print(res)       }else{         print("incorrect username , password")     }   } 

can please advise best way forward? - need retrieve saved core data , check if matches.

here core data model:

look below code

   func checkforusernameandpasswordmatch (username : string, password : string) ->bool     {         let appdelegate = uiapplication.sharedapplication().delegate as! appdelegate         var managedobjectcontext = appdelegate.managedobjectcontext         var predicate = nspredicate (format:"username = %@" ,username)         var fetchrequest = nsfetchrequest ( entityname: "userentity")         fetchrequest.predicate = predicate         var error : nserror? = nil         var fetchrecult = managedobjectcontext?.executefetchrequest(fetchrequest, error: &error)         if fetchrecult?.count>0         {             var objectentity : userentity = fetchrecult?.first as! userentity             if objectentity.username == username && objectentity.password == password             {                 return true   // entered username & password matched              }             else             {                 return false  //wrong password/username             }         }         else         {             return false         }     } 

moreover not save password in device if working on enterprise product.